Lochinvar EFB85 User manual

EFB Boiler range
Flue Guide
Models covered:
EFB85
EFB105
EFB125
EFB155

Page 1of 19
Contents
GENERAL.....................................................................................................................................................................3
Drawing 1 Boiler terminal locations.........................................................................................................................4
Table 1 Boiler terminal locations .............................................................................................................................4
Table 2 risk assesment ............................................................................................................................................5
Boiler flue information............................................................................................................................................6
CONCENTRIC FLUE SYSTEMS .......................................................................................................................................7
Horizontal Type C13 .................................................................................................................................................7
Plume Management Kits .........................................................................................................................................8
Vertical Type C33......................................................................................................................................................9
Concentric Flue Sizing Calculations........................................................................................................................10
TWIN-PIPE FLUE SYSTEMS TYPE C53 ...........................................................................................................................11
Twin-Pipe Flue Sizing Calculations .........................................................................................................................12
CONVENTIONAL (EXHAUST ONLY) FLUE SYSTEMS TYPE B23........................................................................................14
Conventional Flue Sizing Calculations....................................................................................................................15
COMMON FLUE SYSTEMS .........................................................................................................................................17
ORDER FORM AND NOTES .................................................................................................................................18

Page 2of 19
DOCUMENT CONTROL
Article
Language
Version
Modified by
EFB flue guide
English
V1.5 January 2023
S Hunt

Page 3of 19
GENERAL
Lochinvar CPM Boilers are certified for use on the following flue categories:
Installation type
Category
Description
B23
Open flue
An appliance intended to be connected to a flue that evacuates the products of combustion to the
outside of the room containing the appliance. The combustion air is drawn directly from the room.
C13
Closed Flue
An appliance connected to either a concentric or twin-pipe flue system with a Horizontal flue terminal.
Both the air inlet and flue exhaust must be in the same pressure zone.
C33
Closed Flue
An appliance connected to either a concentric or twin-pipe flue system with a Vertical flue terminal. Both
the air inlet and flue exhaust must be in the same pressure zone.
C43
Closed Flue
An appliance connected to a common air inlet and flue exhaust system, which is designed for more than
one appliance. This common system has a single air inlet and flue exhaust and is part of the building not
the appliance.
C53
Closed Flue
An appliance connected to a twin-pipe flue system with a Horizontal or Vertical flue terminal. Both air
inlet and flue exhaust may be in different pressure zones.
C63
Closed Flue
An appliance intended to be connected to a separately approved and marketed system for the supply of
combustion air and discharge of combustion products (i.e. other than that supplied by the water heater
manufacturer).
C83
Closed Flue
An appliance connected via one of its ducts to a single or common duct system. This duct system consists
of a single natural draught duct (i.e. not incorporating a fan) that evacuates the products of combustion.
The appliance is connected via a second of its ducts to a terminal, which supplies air to the appliance
from outside the building.
All installations should comply with the requirements of:
1. For appliances up to 70kW net input- BS5440-1:2008- Flueing and ventilation for gas appliances of rated
input not exceeding 70 kW net (1st, 2nd and 3rd family gases). Specification for installation of gas appliances
to chimneys and for maintenance of chimneys.
a. Refer to drawing 1 and table 1 for details of terminal locations.
2. For appliances over 70kW net input- IGEM/UP/10 Edition 4 +A: 2016 - Installation of flued gas appliances in
industrial and commercial premises, specific attention should be paid to the following sections.
a. Refer to drawing 1 and table 1 for details of terminal locations.
b. Horizontal terminations shall be located according to the minimum distances given in table 1, and
subject to the risk assessment criteria shown in table 2.
c. Horizontal flue terminations (other than for fan dilution systems) must not be installed for any single
appliance or group of appliances with a total nett input exceeding 333kW net heat input.
d. For any single appliance or group of appliances with a total net heat input exceeding 333 kW, the
general requirements of IGEM/UP/10 Edition 4 +A: 2016 shall apply and approval must be sought
from the Local Authority prior to commencement of the installation.
3. The Clean Air Act for installations exceeding 333kW nett input.

Page 4of 19
DRAWING 1BOILER TERMINAL LOCATIONS
TABLE 1BOILER TERMINAL LOCATIONS
The table above should be used in conjunction with the following notes:
Distances shown ensure the boiler will operate without problems under most conditions, these distances can be reduced in certain circumstances
The above should be read in conjunction with the latest edition of BS5440-1 and IGEM UP10
For boiler installation above 333kW nett input the table above should not be used, these installations are covered by the clean air act and must
comply with its requirements in full, contact your local environmental health team for further guidance
For further guidance please contact Lochinvar Technical support
Location Description EFB85 EFB105 EFB125 EFB155
A Directly below an opening, air brick, opening windows etc.# mm 2500 2500 2500 2500
B Above an opening, air brick, opening windows etc. mm 631 760 896 1092
C Horizontally to an opening, air brick, opening windows etc.# mm 666 775 930 1113
D Below a gutter or sanitary pipework mm 200 200 200 200
E Below the eaves mm 200 200 200 200
F Below a balcony or car port roof mm
G From a vertical drain or soil pipe mm 150 150 150 150
H From an internal or external corner mm 1210 1560 2057 2640
I Above ground, roof or balcony level mm 300 300 300 300
J From a surface facing the terminal mm 1211 1560 2057 2640
K From a terminal facing the terminal mm 2176 2468 2883 3370
L From an opening in the car port (e.g. door, window) into the dwelling mm
M Vertically from a terminal on the same wall mm 2500 2500 2500 2500
N Horizontally from a terminal on the same wall mm 600 600 900 900
N+ Vertically from a terminal on the same roof mm 600 600 900 900
P From a vertical structure on the roof mm 1500 1500 1500 1500
Q Above intersection with the roof mm 324 364 422 489
Not reccomended see UP10 risk assesment
Not reccomended see UP10 risk assesment

Page 5of 19
TABLE 2RISK ASSESMENT
The table below is an excerpt from IGEMUP10 and should be used in conjunction with that document
Further to the requirements in IGEM/UP/10 Edition 4 +A: 2016 Section 8 under clause 8.7.3.3 and Figure 7 the following risk assessment
gives guidance for the positioning of horizontal flues. This form should be completed before work commences and undertaken by a person
who is competent to undertake the risk assessment.
Type C appliances with net heat input exceeding 70 kW and not exceeding 333 kW low level flue discharge risk assessment (including net
heat input for groups of appliances)
No.
Regarding the flue position
No
Yes
1
Is the proposed flue termination within the distance in Figure K of a road, path,
track, thoroughfare, walkway, property boundary or area, which is used for general
public access other than for maintenance purposes?
No
Yes
2
Is the proposed flue termination within the distance in Figure K to a playground,
school, yard, seating area, or area where there may be a public gathering
No
Yes
3
If the proposed flue termination enclosed on more than two sides then does it
comply with the requirements of Figure 11B?
No
Yes
4
Is the proposed flue termination within the distance in Figure K of a surface or
building element that may be affected by corrosion or deterioration from plume
condensate?
No
Yes
5
Is the proposed flue position in an area where vehicles could be parked within
distances from Figure 12 Line G to the flue?
No
Yes
6
Are there shrubs or trees within minimum distances shown on Figure K of the
proposed terminal position?
No
Yes
7
Is the proposed flue termination within a light well?
No
Yes
8
Are the products of combustion from the proposed flue position likely to build up
under unfavourable atmospheric conditions, due to poor cross flow of air caused by
enclosures or adjacent structures and/or likely to cause nuisance?
No
Yes
9
Is the flue termination position likely to cause a nuisance to adjoining properties?
No
Yes
Building Regulations part J
10
Is the proposed flue termination less than 300 mm from the boundary of the
property, as measured from the side of the terminal to the boundary?
No
Yes
Regarding the Clean Air Act
11
Is the total output of the individual, or group of flue terminals (if within 5U (see
A3.7)), greater than 333 kW net heat input?
No
Yes
General
12
Are there any other considerations that are required for this risk assessment, see
separate sheet.
No
Yes
13
Comments:
If all answers are Blue then the flue position should be suitable
If any answer is Orange then the flue position is unsuitable, consider revising the position or type of flue outlet or contact the local
Environmental Health officer for assistance and/or approval

Page 6of 19
BOILER FLUE INFORMATION
Model Number
EFB85
EFB105
EFB125
EFB155
FLUE DATA TYPE B23
Nominal flue diameter
mm
100
150
Maximum flue gas temp
°C
90
Flue gas temperature
°C
60-90
Flue draught requirements
mbar
-0.03 to -0.1
Available pressure for the flue system
Pa
200
Maximum flue gas volume
g/s
28.9
38.6
71.7
86.2
FLUE DATA TYPE C13 & C33
Nominal flue diameter
mm
100/150
N/A
Flue gas temperature
°C
60-90
FLUE DATA TYPE C43 & C53
Nominal flue diameter
mm
100
150
Flue gas temperature
°C
60-90

Page 7of 19
CONCENTRIC FLUE SYSTEMS
HORIZONTAL TYPE C13
CPMH003 CONCENTRIC HORIZONTAL FLUE ASSEMBLY
MODELS - EFB85, EFB105, EFB125
COMPONENTS INCLUDED
Item No.
Description
Included
LV310758B
CONCENTRIC HORIZONTAL TERMINAL Ø100/150mm PP
1
M84410B
CONCENTRIC BEND 90° Ø100/150mm PP SHORT RADIUS
1
Maximum resistance in the flue system ≤200pa
Additional Flue Ancillary Items
Item No.
Description
M84405B
CONCENTRIC EXTENSION Ø100/150mm Cuttable
M84402B
CONCENTRIC EXTENSION Ø100/150mm PP FIXED
M84412B
CONCENTRIC BEND 90° Ø100/150mm PP (A=223mm B=208mm)
M84413B
CONCENTRIC BEND 45° Ø100/150mm PP (A=128mm B=128mm)
M84421B
SAMPLING POINT Ø100/150mm PP
M87196B
WALL CLAMP Ø150mm
EFB Models 155 are not suitable for Concentric flue installations

Page 8of 19
PLUME MANAGEMENT KITS
For installations where the flue exhaust may present a nuisance pluming problem but is installed as per IGEM/UP/10 then
Lochinvar can offer a plume management kit as below.
LG800009B CONCENTRIC HORIZONTAL PLUME ASSEMBLY
MODELS - EFB85, EFB105
COMPONENTS INCLUDED
Item No.
Description
Included
1
CONCENTRIC BEND 90° Ø100/150mm PP SHORT RADIUS
1
2
CONCENTRIC EXTENSION Ø100/150mm WITH TERMINAL
BEND
1
3
EXTENSION Ø100mm (1000mm) PP (black for external use)
1
4
BEND 90° Ø100mm PP (black for external use)
1
5
SPRING
1
6
FLUE EXHAUST Ø100mm (black for external use)
1
7
WALL BAND Ø100mm (black for external use)
1
The flue terminal location before the Plume kit is fitted must comply with the guidance shown within the
EFB Installation manual and the requirements of IGEM/UP/10.
The plume kit cannot be used with models EFB125-EFB155 due to the high resistance within the kit
Due to the high resistance within the plume kit, no further extensions or bends are allowed

Page 9of 19
VERTICAL TYPE C33
CPMV003 CONCENTRIC VERTICAL FLUE ASSEMBLY
MODELS - EFB85, EFB105, EFB125
COMPONENTS INCLUDED
Item No.
Description
Included
LV310754B
CONCENTRIC VERTICAL TERMINAL Ø100/150mm PP
1
M84405B
CONCENTRIC EXTENSION Ø100/150mm (500mm) Cuttable
1
M84402B
CONCENTRIC EXTENSION Ø100/150mm (1000mm) PP FIXED
1
Maximum resistance in the flue system ≤200pa
Additional Flue Ancillary Items
Item No.
Description
M84405B
CONCENTRIC EXTENSION Ø100/150mm Cuttable 500mm
M84402B
CONCENTRIC EXTENSION Ø100/150mm PP FIXED 1000mm
M84412B
CONCENTRIC BEND 90° Ø100/150mm PP (A=223mm B=208mm)
M84413B
CONCENTRIC BEND 45° Ø100/150mm PP (A=128mm B=128mm)
M84421B
SAMPLING POINT Ø100/150mm PP
M87196B
WALL CLAMP Ø150mm
LV306017B
SLOPING ROOF FLASHING Ø100/150mm (25°-45°) LEAD
LV302509B
FLAT ROOF FLASHING (170mm) ALU
EFB Models 155 are not suitable for Concentric flue installations

Page 10 of 19
CONCENTRIC FLUE SIZING CALCULATIONS
Maximum Length –Concentric Flue The resistance of the components within the flue determines the maximum length of the flue
system.
The resistance must not exceed 200 Pa.
The information shown in table below is for the Lochinvar supplied flue system only; other flue system
suppliers may have different values.
Resistance in the flue system components
Concentric
Boiler
EFB 85
EFB 105
EFB 125
EFB 155
Item
resistance [Pa]
flue gas
100/150
Straight tube/m
2.9
4.1
6.2
-
45° bend
6.4
9.0
13.6
-
90° bend
10.2
14.5
21.9
-
roof terminal
31.2
44.3
66.7
-
wall terminal
10.8
15.3
23.0
-
adaptor
0.4
0.6
0.9
-
air supply
100/150
Straight tube/m
9.2
13.1
19.7
-
45° bend
8.1
11.4
17.2
-
90° bend
11.7
16.6
25.1
-
roof terminal
43.3
61.4
92.4
-
wall terminal
43.3
61.4
92.4
-
adaptor
39.2
55.6
83.8
-
* Never reduce pipe diameters relative to boiler connections
Example: Concentric Horizontal flue system
Calculation example with given lengths: checking resistance
Boiler type:
EFB 85
FLUE GAS
Diameter: 100/150 mm.
quantity
Pa
Pa total
Straight tube m
total
9
2.9
26.1
Bend
90°
1
10.2
10.2
Concentric terminal
wall
1
10.8
10.8
resistance flue gas outlet:
47.1
AIR SUPPLY
Diameter: 100/150 mm.
quantity
Pa
Pa total
Straight tube m
total
9
9.2
82.8
Bend
90°
1
11.7
11.7
Concentric terminal
wall
1
43.3
43.3
resistance air supply:
137.8
Total resistance flue gas outlet and air supply:
184.9
The total resistance is less than 200 Pa.
This flue gas / air supply system is OK.
CONCENTRIC
FLUE GAS
OUTLET
ROOF
WALL

Page 11 of 19
TWIN-PIPE FLUE SYSTEMS TYPE C53
Introduction Twin-Pipe and Conventional Flue Systems
Due to the varying and sometimes complex nature of twin-pipe and conventional flue systems Lochinvar do not offer a standard
flue kit for these flue types. The following pages show the flue components available including the items that MUST BE ORDERED
to start and terminate the system.
TWIN-PIPE FLUE SYSTEMS
MODELS - EFB85, EFB105, EFB125
COMPONENTS REQUIRED TO START INSTALLATION
VERTICAL FLUE
Item No.
Description
Number
Required
LE04018220
CONCENTRIC TO TWIN PIPE ADAPTER Ø100/150-2X 100
1
LV310754B
CONCENTRIC VERTICAL TERMINAL Ø100/150mm PP
1
LV305039B
HORIZONTAL AIR INLET Ø100mm ALU
1
HORIZONTAL FLUE
Item No.
Description
Number
Required
LE04018220
CONCENTRIC TO TWIN PIPE ADAPTER Ø100/150-2X 100
1
LV310758B
CONCENTRIC HORIZONTAL TERMINAL Ø100/150mm PP
1
LV305039B
HORIZONTAL AIR INLET Ø100mm ALU
1
Maximum resistance in the flue system ≤200pa
Additional Flue Ancillary Items
Item No.
Description
M85176B
EXTENSION Ø100mm (500mm) PP
M85177B
EXTENSION Ø100mm (1000mm) PP
M85181B
BEND 90° Ø100mm PP (A=115mm B=115mm)
M85182B
BEND 45° Ø100mm PP (A=78mm B=65mm)
M87193B
WALL BAND Ø100mm
EFB Models 155 are not suitable for Twin-pipe flue installations

Page 12 of 19
TWIN-PIPE FLUE SIZING CALCULATIONS
Maximum Length –Twin-Pipe Flue The resistance of the components within the flue determines the maximum length of the flue
system.
The resistance must not exceed 200 Pa.
The information shown in table below is for the Lochinvar supplied flue system only; other flue system
suppliers may have different values.
Twin-pipe
BOILER
EFB 85
EFB 105
EFB 125
EFB 155
Item
resistance [Pa]
flue gas
100
straight tube/m
2.8
4
6
-
45° bend
6.4
9
13.6
-
90° bend
10.2
14.5
21.9
-
Flue outlet zeta=0.05
0.5
0.8
1.2
-
Flue outlet zeta=1.0
10.8
15.3
23
-
Flue outlet zeta=1.5
16.2
22.9
34.5
-
130
straight tube/m
0.7
1
1.5
2.2
45° bend
1.3
1.8
2.7
4
90° bend
3
4.3
6.4
9.5
Flue outlet zeta=0.05
0.2
0.3
0.4
0.6
Flue outlet zeta=1.0
3.6
5.1
7.7
11.4
Flue outlet zeta=1.5
5.4
7.7
11.6
17.2
150
straight tube/m
0.4
0.6
0.9
1.3
45° bend
0.7
0.9
1.4
2.1
90° bend
1.6
2.2
3.3
4.9
Flue outlet zeta=0.05
0.1
0.1
0.2
0.3
Flue outlet zeta=1.0
2
2.8
4.3
6.3
Flue outlet zeta=1.5
3
4.3
6.4
9.5
Roof terminal
3.4
4.8
7.3
10.8
reducer 150 to 130
2.1
3
4.5
6.6
air supply
100
straight tube/m
3.2
4.6
6.9
-
45° bend
7.4
10.5
15.7
-
90° bend
11.9
16.8
25.3
-
air inlet zeta=1.0
12.5
17.7
26.7
-
130
straight tube/m
0.8
1.1
1.7
2.5
45° bend
1.5
2.1
3.1
4.6
90° bend
3.5
4.9
7.4
11
air inlet zeta=1.0
4.2
5.9
9
13.3
150
straight tube/m
0.5
0.7
1
1.5
45° bend
0.8
1.1
1.6
2.4
90° bend
1.8
2.6
3.9
5.7
air inlet zeta=1.0
2.3
3.3
5
7.3
* Never reduce pipe diameters relative to boiler connections
FLUE GAS
OUTLET
zeta=0
open
zeta=0,05
conical
H/D=1,0
zeta=1,0
H/D=0,5
zeta=1,5
AIR INLET
H/D=1,0
zeta=1,0

Page 13 of 19
This table may only be used for a single flue/air system for one boiler
Do NOT use this table for common flue systems with cascade boilers.
Example: Twin-Pipe flue system
Calculation example with given lengths: checking resistance
Boiler type:
EFB 125
Flue gas
Diameter: 100 mm
quantity
Pa
Pa total
Straight tube /m
total
9
6
54
Bend
90°
2
21.9
43.8
Flue outlet
zeta=1.0
1
23
23
Total resistance flue gas outlet:
120.8
Air supply
Diameter: 100 mm
quantity
Pa
Pa total
Straight tube /m
total
8
6.9
55.2
Bend
90°
2
25.3
50.6
Air inlet
zeta=1.0
1
26.7
26.7
Total resistance air supply:
132.5
Total resistance flue gas outlet and air supply:
253.3
The total resistance is > than 200 Pa.
This flue gas/ air supply system is UNSUITABLE. Consider using 150mm flue
pipe or altering the flue and air supply route.

Page 14 of 19
CONVENTIONAL (EXHAUST ONLY) FLUE SYSTEMS TYPE B23
CONVENTIONAL FLUE SYSTEMS
MODELS - EFB85, EFB105, EFB125
COMPONENTS REQUIRED TO START INSTALLATION
VERTICAL FLUE
Item No.
Description
Number Required
LE022500019
AIR INLET GUARD
1
LV310754B
CONCENTRIC VERTICAL TERMINAL Ø100/150mm PP
1
Maximum resistance in the flue system ≤200pa
Additional Flue Ancillary Items
Item No.
Description
M85176B
EXTENSION Ø100mm (500mm) PP
M85177B
EXTENSION Ø100mm (1000mm) PP
M85181B
BEND 90° Ø100mm PP (A=115mm B=115mm)
M85182B
BEND 45° Ø100mm PP (A=78mm B=65mm)
M87193B
WALL BAND Ø100mm
LV306017B
SLOPING ROOF FLASHING Ø100/150mm (25°-45°) LEAD
LV302509B
FLAT ROOF FLASHING (170mm) ALU
CONVENTIONAL FLUE SYSTEMS
MODELS - EFB155
COMPONENTS REQUIRED TO START INSTALLATION
VERTICAL FLUE
Item No.
Description
Number Required
M70359B
ROOF TERMINAL - 150MM
1
LE022500018
AIR INLET GUARD
1
Maximum resistance in the flue system ≤200pa
Additional Flue Ancillary Items
Item No.
Description
LV310694B
EXTENSION Ø150mm (1000mm) PP Cutable
LV310695B
EXTENSION Ø150mm (2000mm) PP Cutable
LV310664B
BEND 45° Ø150mm PP (A=98mm B=103mm)
LV310665B
BEND 90° Ø150mm PP (A=183mm B=166mm)
M87196B
WALL CLAMP Ø150mm
B23

Page 15 of 19
CONVENTIONAL FLUE SIZING CALCULATIONS
Maximum Length –Conventional Flue The resistance of the components within the flue determines the maximum length of the
flue system.
The resistance must not exceed 200 Pa.
The information shown in table below is for the Lochinvar supplied flue system only; other flue system
suppliers may have different values.
Twin-pipe
BOILER
EFB 85
EFB 105
EFB 125
EFB 155
Item
resistance [Pa]
flue gas
100
straight tube/m
2.8
4
6
-
45° bend
6.4
9
13.6
-
90° bend
10.2
14.5
21.9
-
Flue outlet zeta=0.05
0.5
0.8
1.2
-
Flue outlet zeta=1.0
10.8
15.3
23
-
Flue outlet zeta=1.5
16.2
22.9
34.5
-
130
straight tube/m
0.7
1
1.5
2.2
45° bend
1.3
1.8
2.7
4
90° bend
3
4.3
6.4
9.5
Flue outlet zeta=0.05
0.2
0.3
0.4
0.6
Flue outlet zeta=1.0
3.6
5.1
7.7
11.4
Flue outlet zeta=1.5
5.4
7.7
11.6
17.2
150
straight tube/m
0.4
0.6
0.9
1.3
45° bend
0.7
0.9
1.4
2.1
90° bend
1.6
2.2
3.3
4.9
Flue outlet zeta=0.05
0.1
0.1
0.2
0.3
Flue outlet zeta=1.0
2
2.8
4.3
6.3
Flue outlet zeta=1.5
3
4.3
6.4
9.5
Roof terminal
3.4
4.8
7.3
10.8
reducer 150 to 130
2.1
3
4.5
6.6
air supply
100
straight tube/m
3.2
4.6
6.9
-
45° bend
7.4
10.5
15.7
-
90° bend
11.9
16.8
25.3
-
air inlet zeta=1.0
12.5
17.7
26.7
-
130
straight tube/m
0.8
1.1
1.7
2.5
45° bend
1.5
2.1
3.1
4.6
90° bend
3.5
4.9
7.4
11
air inlet zeta=1.0
4.2
5.9
9
13.3
150
straight tube/m
0.5
0.7
1
1.5
45° bend
0.8
1.1
1.6
2.4
90° bend
1.8
2.6
3.9
5.7
air inlet zeta=1.0
2.3
3.3
5
7.3
FLUE GAS
OUTLET
zeta=0
open
zeta=0,05
conical
H/D=1,0
zeta=1,0
H/D=0,5
zeta=1,5

Page 16 of 19
Example: Single flue gas outlet. Air supply from boiler room
Calculation example with given lengths: checking resistance
Boiler type:
EFB 105
FLUE GAS
Diameter: 100 mm
Number
Pa
Pa total
Straight tube m¹
total
13
4.0
52
Bend
90°
2
14.5
29
Bend
45°
2
9
18
Flue outlet
zeta = 1.0
1
15.3
12.8
Total resistance flue gas:
111.8
The total resistance is less than 200 Pa.
This flue gas system is OK.

Page 17 of 19
COMMON FLUE SYSTEMS
Applicable only when installer not using the Lochinvar supplied flue system
EFB boilers are certified for use on common (over pressure) flue systems of the following type:
1. C10 (3) Flue gas discharge through individual or shared flue ducting built into the building.
a. Air supply inlet and flue gas outlet
b. Condensate is not allowed to enter the boiler
c. Closed or open air supply from outside or room
2. C12 (3) Flue gas discharge through individual or shared flue ducting built into the building.
a. Air supply inlet and flue gas outlet
b. Condensate is not allowed to enter the boiler
c. Closed air supply from outside
Technical data
Data
Unit
EFB85
EFB105
EFB125
EFB155
Nominal flue diameter
mm
100
100
100
150
Nominal flue gas temp
°C
85
85
85
85
Maximum flue gas temp
°C
90
90
90
90
Minimum flue gas temp
°C
35
35
35
35
Q flue gas volume(high fire)
g/s
45.33
53.66
66.24
80.61
Q flue gas volume(Minimum)
g/s
9.03
10.39
13.84
20.53
CO2 (high fire)
%
8.4
8.4
8.4
8.4
CO2 (low fire)
%
7.9
7.9
7.9
7.9
Available pressure at the boiler flue outlet
Pa
200
200
200
200
Maximum allowable flue gas pressure with one or more boilers firing#
Pa
25
25
25
25
# measured at the flue outlet of a non-firing boiler
Flue specification
CE string flue
gas material
European
standard
Temperature
class
Pressure class
Resistance to
condensate
Corrosion
resistance class
Metal: liner
specifications
Soot fire
resistance class
Distance to
combustible
material
Plastics:
location
Plastics: fire
behaviour
Plastics:
enclosure
Min. req. PP
EN 14471
T120
P1
W
1
O
30
I of E
C/E
L
Min. req. SS
EN 1856-1
T120
P1
W
1
L20040
O
40
Safety measures Common Flue Systems
When installing EFB boilers with a common flue system and the combustion air is drawn directly from the room, additional safety measures
have to be taken.
Potential hazard
EFB boilers are equipped with a Non-return valve to prevent recirculation of flue gases from a firing boiler through one or more boilers which
are not running and are connected with a common flue system. This Non-return valve might leak over time due to pollution, incorrect
maintenance or other unexpected cause. When combustion air is drawn from the room, flue gas might enter the room, which could lead to
Carbon Monoxide (CO) poisoning.
Safety measures:
To cover this risk additional checks/safety measures should be considered:
1. Combustion and cooling air must be provided as per the requirements shown within the EFB Installation manual and the
requirements of IGEM UP10 and BS6644 and the Gas safety regulations.
2. Always use the standard built in EFB cascade manager and ensure power mode 2 is switched on. Power mode 2 is selected at
parameter 148.
Additional Safety Advice
1. Consider the use of a CO detector for alarm and as a switching module to switch off all the boilers. The CO alarm system must be in
according with national and local standards. See EFB Installation manual for further details.
2. Consider combining all air intake terminals to the boilers; this does not have to be piped to outside air.

Page 18 of 19
ORDER FORM AND NOTES
Notes-Items to order
Item No.
No required
Notes
Contact Lochinvar customer service to order additional flue items on 01295 269981

Page 19 of 19